Watering cucumbers in spring greenhouse
Observe the cucumber seedling watering. During the seedling stage, the leaves turn yellow, and the rooting phenomenon occurs. Generally, the ground temperature is low and the water is too large; the leaves are green and white, and the adventitious roots under the hypocotyls are normal, indicating that the temperature and humidity are suitable; Glossy, green and flat, the seedling head stretches, the tendril stretches and curls moderately, the flowering node is 40-50 cm away from the growth point, indicating normal moisture; the tap is not developed, the leaf coating is tight, and the flowering node is 20-30 cm away from the growth point , Indicating lack of water; growth is tight, flower topping appears, tendrils are short and curled early, indicating severe water shortage. The seedling head is raised, the tendrils are thick and straight, the leaves are large and thin, and the flowering nodes are more than 50 to 60 cm away from the growth point, which is manifested by excessive water.
Water according to the birth stage. On the basis of general watering, each plant is poured with 1.5 to 2 kg of planting water, and the slow seedling water is poured 5 to 7 days after planting. When 70% to 80% of the root melons grow to about 10 cm in length in the field, the melons will turn black and the melon strips will grow quickly before watering. If the soil moisture is good, the water in this period can be extended until the root melon is harvested before pouring. Plants are short at the beginning of the melon stage, the leaf transpiration is small, the number of melons is also small, and the amount of ventilation is also small. Generally, watering once every 5 to 7 days, the watering must be lightly poured under the film; As a result, the number increases and the amount of ventilation increases. Generally, water one time every 3 to 4 days and increase the amount of water. Plants at the end of the melon stage tend to age, and the number of watering and the amount of water should be reduced as appropriate.
Use mulch to cover drip irrigation for watering. Cucumber cultivation in greenhouses, high temperature, high humidity or low temperature and high humidity are all an important reason for the spread of cucumber diseases. The use of traditional extensive flooding irrigation method is easy to lower the temperature and increase the humidity. If you use drip irrigation under the film, that is, cover with plastic film, drip irrigation (or drip irrigation tape), not only can the plastic film cover increase the ground temperature and improve the near-field light, but also reduce soil moisture evaporation, reduce air humidity, and reduce the occurrence of cucumber diseases. .
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